If you’re looking for a photo editor for your desktop (Windows, chromebook, or Mac), tablet (android or iPad) or smart phone (android or iPhone) you might want to try pix PIXLR. The desktop version runs in a web browser and has a lot of the capabilities of Photoshop Elements including layers. The tablet and phone apps are less capable.
If you’re looking for an online editor that can process RAW files try POLARR. It has lots of capabilities but its user interface is quite different from Photoshop Elements.